static String removeQeQuoting()

in vault-validation/src/main/java/org/apache/jackrabbit/vault/validation/spi/impl/OverlappingFilterValidator.java [283:347]
59 lines of code
17 McCabe index (conditional complexity)

    static String removeQeQuoting(String pattern) {
        final int pLen = pattern.length();
        int[] temp = pattern.codePoints().toArray();
        int i = 0;
        while (i < pLen - 1) {
            if (temp[i] != '\\')
                i += 1;
            else if (temp[i + 1] != 'Q')
                i += 2;
            else
                break;
        }
        if (i >= pLen - 1) // No \Q sequence found
            return pattern;
        int j = i;
        i += 2;
        int[] newtemp = new int[j + 3 * (pLen - i) + 2];
        System.arraycopy(temp, 0, newtemp, 0, j);

        boolean inQuote = true;
        boolean beginQuote = true;
        while (i < pLen) {
            int c = temp[i++];
            if (!ASCII.isAscii(c) || ASCII.isAlpha(c) || c == '/') {
                newtemp[j++] = c;
            } else if (ASCII.isDigit(c)) {
                if (beginQuote) {
                    /*
                     * A unicode escape \[0xu] could be before this quote, and we don't want this numeric char to processed as part of the
                     * escape.
                     */
                    newtemp[j++] = '\\';
                    newtemp[j++] = 'x';
                    newtemp[j++] = '3';
                }
                newtemp[j++] = c;
            } else if (c != '\\') {
                if (inQuote)
                    newtemp[j++] = '\\';
                newtemp[j++] = c;
            } else if (inQuote) {
                if (temp[i] == 'E') {
                    i++;
                    inQuote = false;
                } else {
                    newtemp[j++] = '\\';
                    newtemp[j++] = '\\';
                }
            } else {
                if (temp[i] == 'Q') {
                    i++;
                    inQuote = true;
                    beginQuote = true;
                    continue;
                } else {
                    newtemp[j++] = c;
                    if (i != pLen)
                        newtemp[j++] = temp[i++];
                }
            }

            beginQuote = false;
        }
        return new String(newtemp, 0, j); // double zero termination
    }